Machine for use in the manufacture of boots and shoes.



A. H. PRENZEL.

MACHINE FOR. USE IN THE MANUPAGTURE 0F BOOTS AND SHOES.

APPLICATION FILED MAY 29, 1912 1,093,008 Patented Apr. 14, 1914.

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ADAM H. PRENZEL, 01* HALIFAX, PENNSYLVANIA, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATEESON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MACHINE FOR USE IN THE MANUFACTURE OF BOOTSAND SHOES.

eas es.

To all whom it may cmwern Be it known that I, ADAM H. PRENZEL, a citizen of the United States, residing at Halifax, in the county of Dauphin and State of Pennsylvania, have invented certain Improvements in Machines for Use in the l/Ianufacture of Boots and Shoes, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters 1 on the drawings indicating like parts in the several figures.

This invention relates to machines for use in the manufacture of boots and shoes, and is of particular utility in the process of manufacturing stitch-down shoes. In making shoes of the latter type, the upper is attached to the sole by a line of fastenmgs extending around the margin of the sole some distance back from the sole edge, thus leaving the out-turned flange of the upper lying upon the upper marginal surface of the sole. Later a welt is secured upon this outturned flange by a line of stitches or other fastenings that extend through the welt, flange and sole, or soles, and permanently secure these parts together. Prior to the at tachment of the welt, however, it is necessary to trim off the portions of the outturned flange of the upper that project beyond the edge of the sole. Usually it is preferable to trim this flange along a lme lying back of the sole edge, so that the welt may be pulled down tightly on to the face of the sole near the edge, where it will conceal the trimmed edge of the lining and upper leather, which otherwise would be eX- posed to view between the welt and sole and would present an objectionable appearance. Furthermore, it is desirable, before the welt is attached, to beat down the out-turned flange'of the upper, particularly around the toe of the shoe where it is likely'to bunch and wrinkle, and thus to provide a smooth surface for the reception of the welt.

It is the chief object of this invention to devise a machine for performing th'ese'operations. To these ends the invention pro vides novel trimming and pounding mechanisms preferably, but not necessarily, arranged to operate simultaneously on the work; novel gagingand supporting means for properly positioning the work in the machine; andfsuitable adjustments for en- Specification of Letters Patent.

Application filed May 29, 1912.

Patented Apr. 1t, 1914:.

Serial No. 700,454.

abling the machine to operate upon shoes differing widely in style and character.

The invention will be readily understood from the following description, reference being made to the accompanying drawings, in which.

Figure 1 shows in side elevation a machine embodying the present invention; Fig. 2 shows in side elevation certain parts of the machine shown in Fig. 1 as they would appear when operating upon a shoe; Fig. 3 is a cross sectional viewron the line 3-3, Fig. 1; and Fig. 4 is a view in front elevation of the parts engaging the work.

The machine shown comprises a frame 2, having suitable bearings for the support of a rotary shaft 4 which is driven by a belt running over a pulley 6 fixed thereon. This shaft carries an eccentric that rotates in, and carries with it, a block 8 which fits snugly, but slidingly, between the machined faces of a forked arm of a bell crank lever 10 mounted to oscillate about a pivot 12. The other arm of this lever is pivoted to a link 14;, which in turn is pivotally connected at 16 to one arm of another bell crank lever 18, fulcrumed on the machine frame at 20. An arm 22 projecting forwardly from the lever 18 is grooved on one side to receive the shank of a tool holder 2-1; and this holder is secured to the arm by means of a bolt 26 that extends through a slot 28 of the shank, and clamps it adjustably to the lever arm. The body of the holder 24: extends at substantially right angles to its shank and is provided with an internal guideway, substantially rectangular in cross section, for the reception of a hammer 30. The hammer is designed to slide freely in this guideway and, in order to limit its downward move ment relatively to the holder, it is provided, near its upper end, with two projecting shoulders 32 that engage the bottom of a slot which forms an extension and enlarge ment of the guideway. The hammer normally is held atth e downward limit of its movement by means of a leaf spring 34:. having an aperture through which a reduced portion oft-he upper end of thehammer 24. Adjoining the guideway for the hammer 30 is another guideway extending parallel thereto, but wider than the first guideway, for the reception of the trimming knife 38. The knife may be adjusted longitudinally in its guideway, and may be clamped in adjusted position by a bolt 40 that is threaded into the holder and bears against the knife.

The knife and hammer are mounted directly over a feed wheel 42, which supports the work during the trimming and pounding operations. This wheel rotates on a stud supported in a bracket that mounted on a movable table 44; and it has flxed thereto a bevel gear 46 which meshes with a similar gear 48. The latter gear is supported by the table 44 and is splined on a shaft 50 so that it rotates with this shaft but may slide axially thereon. The shaft is driven by a worm gear 52 which meshes with a worm carried by the driving shaft 4.

It will now be understood that, when the driving shaft is rotated, the lever 10 will be oscillated about its fulcrum 12 by means of the eccentric and the block 8 carried thereby, and that this motion will be transmitted through the link 14 to the bell crank lever 18, causing the holder 24 to reciprocate toward and from the periphery of the feed wheel 42. At the same time, the gear connections between the driving shaft 4 and the feed wheel 42 will cause the wheel to rotate to feed the stock along under the hammer 30 and knife 38,

In order to aid the workman in guiding the shoe for the operation of the tools thereon, an edge guiding or gaging roll 54 is rotatably mounted with its edge close to the periphery of the feed wheel 42. A slide 56 supports the roll 54 and is secured, by means of a screw 58 projecting through a slot in the plate, to a part of the frame that extends substantially parallel with the axis of rotation of the feed wheel 42. This arrangement permits the adjustment of the guiding roll 54 relatively to the periphery of the feed wheel. The plate 55, secured to the slide 56 beside and partially encircling the feed roll 54, aids the operator in guiding the shoe properly for the action of the knife and hammer.

For the purpose of facilitating the introduction of the work into the machine while it is running, provision is made for moving the feed wheel away from the path of movement of the tools. To this end the table 44 is provided with a depending stem 60 which slides freelv through an aperture formed in a bracket 62 secured to the machine frame 2. A spring 64, backed up by a sleeve 66 threadedinto the aperture of the bracket 62, encircles the stem 60 and acts upon a shoulder formed thereon to raise the stem and thereby tohold the feed wheel in its uppermost position. This movement of the feed wheel under the influence of the spring 64 is limited by a screw 68 that projects upwardly through an aperture in the bracket 62, and is threaded into the table 44. This screw also serves to adjust the position of the feed wheel relatively to the tool holder 24, and the other parts of the machine. A chain 70 connects the lower end of the stem .60 to a foot treadle (not shown) by means of which the table and feed wheel may be depressed 42, and the edge of the sole bearing against the guiding roll 54. The face of the hammer 30 is set slightly below the edge of the knife 38 and, consequently, upon the downward stroke of the holder, the hammer strikes the work in advance of the knife. The spring 34 permits the hammer to slide yieldingly through the holder as the holder continues on its downward movement. lVhile the hammer thus holds the stock pressed against the sole, the edge of the knife 38 enters the flange of the upper and cuts entirely through it. position of the knife is so adjusted in its holder, or the position of the feed wheel is so adjusted by means of the screw 68, that the knife cuts entirely through the flange of the upper and slightly into the upper face of the sole. This adjustment insures a clean cut. Furthermore, it is usually preferable to adjust the edge guiding roll 54 so that the line of cut of the knife 38 will lie just back of the sole edge; or this adjustment may be effected by moving the holder 24 in the arm 22 of hell crank lever 18. Upon the return stroke of the holder 24, the spring 34 keeps the hammer 30pressed against the work until after the knife 38 has been lifted clear of the flange; but when the shoulders 32 of the hammer strike the bottom of the slot in which they slide, the holder then swings the hammer upwardly out of contact with the work. The feed wheel 42 moves the work along under the holder while it is guided by Preferably, the v the operator to cause the entire margin of ously therewith to cut through said flange against the surface of the sole.

2. A machine for operating upon stitchdown shoes, comprising in combination, means for pounding the out-turned flange of the upper against the margin of the shoe sole, and means acting simultaneously therewith to trim off the marginal portion of said flange.

3. A machine for operating upon stitchdown shoes, comprising in combination, means for pounding the out-turned flange of the upper against the sole, and means acting while the stock is held under pressure by said pounding means to cut through said flange against the surface of the sole.

4. A machine for operating upon stitchdown shoes, comprising in combination, means for supporting the tread face of a shoe sole, a hammer for pounding the outturned flange of the upper, a knife for trimming said flange, and means for driving said hammer and knife to cause them to operate simultaneously upon the shoe.

5. A machine for operating upon stitchdown shoes, comprising in combination, a feed roll for supporting the tread face of a shoe sole, means for pressing against the sole that portion of the out-turned flange of the upper lying close to the body of the shoe, a knife operating simultaneously therewith, and gaging means for causing said knife to trim said flange along a line lying between the edge of the sole and the body of the shoe.

6. A machine of the class described, comprising in combination, means for supporting the tread face of a shoe sole, a holder, a hammer yieldingly secured in said holder, aknife rigidly mounted in said holder, means for reciprocating said holder toward and from said supporting means, and gaging means for guiding a shoe to cause said hammer and knife to operate simultaneously upon the stock lying along the margin of the shoe sole.

7. A machine of the class described, comprising in combination, a work feeding roll, a holder, a knife rigidly secured in said holder, a hammer yieldingly mounted in said holder, and means for reciprocating said holder to move the knife and hammer toward and from the supporting surface of said roll.

8. A machine of the class described, comprising in combination, a work feeding roll, a holder, a hammer and a knife carried by said holder, means for reciprocating said holder to carry said knife and said hammer toward and from said roll, means whereby a relative adjustment of said holder and roll toward or from each other may be effected, an edge gage positioned adjacent to the periphery of said roll, and means whereby a relative adjustment of said holder and edge gage may be effected in a direction transverse to the direction of movement of said holder.

9. A machine for operating upon stitchdown shoes, comprising in combination, a support for the tread face of a shoe sole, a knife, means for reciprocating said knife toward and from the surface of said support, and means for gaging the position of a shoe to cause said knife to cut through the marginal flange of the upper against the face of the sole to trim said flange along a line lying between the sole edge and the body of the shoe.

10. A machine of the class described, comprising in combination, a feed wheel, a knife, means for reciprocating said knife toward and from the periphery of said wheel, an edge gage positioned close to the periphery of said wheel near the path of travel of said knife, said feed wheel and edge gage being relatively adjustable in a direction substantially parallel to the axis of said wheel.

11. A machine of the class described, comprising in combination, a support for the tread face of a shoe sole, a holder having two guideways formed therethrough, a ham mer positioned in one of said guideways, aspring acting on said hammer to press it toward said support, said hammer and holder having cooperating means for limiting the movement of said hammer by said spring, a knife adjustably positioned in the other guideway, means for clamping said knife in adjusted position, means for recip rocating said holder toward and from said support, and an edge gage adjustable relatively to said support to guide the edge of the sole for the operation of said knife and hammer.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ADAM n. PRENZEL.

VVit-nesses:

FREDERICK L. EDMANDS, LUTHER W. RYAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

